I was trying to figure out why my exposed filters wouldn't show up in Attachment displays and found the ticket pointing out that this module forces exposed filters to be disabled http://drupal.org/node/545602/. Looking at the where the code is now I see that it requires the Ajax option to be enabled to allow exposed filters. I think this should be documented in the README and on the project page.

On a side note... Why wouldn't we want exposed filters to show up on attached Views without Ajax enabled? Because of the potential for namespace collisions of parameters in the URL?